The nematodes, or roundworms, possess a pseudocoelom and consist of both free-living and parasitic forms. Finally, the arthropods, one of the most successful taxonomic groups on the planet, are coelomate organisms with a hard exoskeleton and jointed appendages. 23 сент. 2021 г.
Does roundworm have jointed legs?
The Nematoda (roundworms) are very small worms with tapering ends. The Arthropoda, the largest and most successful phylum of organisms, are characterized by a tough exoskeleton and jointed legs.
What type of structure do roundworms have?
Roundworms have a pseudocoelom and hydrostatic skeleton. Their body is covered with tough cuticle. Free-living roundworms are found mainly in freshwater habitats. Parasitic roundworms have a variety of hosts, including humans.
What type of movement do roundworms have?
Nematodes move by contraction of the longitudinal muscles. Because their internal pressure is high, this causes the body to flex rather than flatten, and the animal moves by thrashing back and forth.
Do roundworms have ridges?
The worm body is often covered with ridges, rings, bristles, or other distinctive structures. The radially symmetrical head of a nematode also has distinct features. The head is covered with sensory bristles and, in many cases, solid "head-shields" around the mouth region.
More useful articles on a similar topic 👇
Do roundworms have invertebrates?Do roundworms have limbs?
